Abstract
Application uniformity from low-pressure trickle irrigation systems can be greatly improved by varying emitter sizes to compensate for friction-induced pressure changes in the lateral pipe. Low-pressure systems using single emitter sizes suffer from nonuniform emitter discharge because friction-induced pressure changes are a large percentage of total pressure. High-pressure trickle systems alleviate this problem by using high head loss emitters. Low-pressure systems, using simple emitters, can have several advantages over high-pressure systems in reduced manufacturing and operating costs, larger emitter orifices to reduce clogging, and simpler flow control devices. Comparable application uniformity can be obtained by varying emitter sizes in the low-pressure systems. Procedures for designing low-pressure multiple-emitter size trickle systems by computer or by a simplified commputation and graphic method were developed.
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